DSSCB Bypass Framing Drift Strut Connector

Simpson Strong-Tie introduces the DSSCB for cold-formed steel construction. The DSSCB is used to anchor cold-formed steel bypass framing to the edge of a floor slab in order to accommodate horizontal building drift. The DSSCB simplifies panelized construction by allowing contractors to install finished panels from the top of the slab without the need to predrill or preinstall anchors for each clip. It also eliminates the coordination difficulties associated with preanchorage of standard bypass clips. With prepunched slots and round holes, the DSSCB is a dual-function connector that can be used for slide-clip and fixed-clip applications.

Key Features

Clips come in lengths of 3 1/2", 6" and 8".

Prepunched slots provide a full 1" of both upward and downward deflection.

Precision-manufactured shouldered screws, provided with DSSCB connectors, are designed to prevent overdriving and to ensure the clip functions properly.

Works with 13/16" and 1 5/8" strut channels as given in the accompanying figures. Common manufactured brands are Unistrut®, PHD and B-Line. Struts are not supplied by Simpson Strong-Tie.

For additional information, see General Notes for Allowable Connector Load Tables.

DSSCB Allowable Slide-Clip Connector Loads are also limited by the Strut Channel Allowable Anchorage Load to Steel table or Concrete Insert Allowable Load Embedded to Concrete. Use the minimum tabulated values from the connector and anchorage load tables as applicable.

Tabulated F1 loads are based on assembly tests with the load through the centerline of the stud. F1 loads require DSHS connector with (1) #10 screw to strut.

DSSCB Allowable Fixed-Clip Connector Loads (lb.)

Model No.

Stud Thickness mil (ga.)

Screw Pattern

No. of #10 Screws

Allowable Loads (lb.)

F1

F2

F3

F4

DSSCB43.5

33 (20)

H

4

220

705

705

345

I, J

2

185

355

355

175

DSSCB46

K

6

220

1,060

1,060

355

L, M

4

185

705

705

350

DSSCB48

N

8

220

1,060

1,060

545

O, P

4

185

705

705

505

DSSCB43.5

43 (18)

H

4

285

1,050

1,050

450

I, J

2

240

525

525

230

DSSCB46

K

6

285

1,125

1,580

460

L, M

4

240

1,050

1,050

455

DSSCB48

N

8

285

1,145

1,580

710

O, P

4

240

1,050

1,050

660

DSSCB43.5

54 (16)

H

4

330

1,410

2,085

1,025

I, J

2

300

1,070

1,045

515

DSSCB46

K

6

360

1,410

3,130

1,050

L, M

4

300

1,410

2,135

1,040

DSSCB48

N

8

360

1,440

3,130

1,145

O, P

4

300

1,420

2,135

1,070

DSSCB43.5

68 (14) and 97 (12)

H

4

395

1,410

2,160

1,025

I, J

2

300

1,080

1,080

515

DSSCB46

K

6

395

1,410

3,130

1,050

L, M

4

300

1,410

2,160

1,040

DSSCB48

N

8

395

1,440

3,240

1,145

O, P

4

300

1,420

2,160

1,070

For additional information, see General Notes for Allowable Connector Load Tables.

DSSCB Allowable Fixed-Clip Connector Loads are also limited by the Strut Channel Allowable Anchorage Load table. Use the minimum tabulated values from the connector and anchorage load tables as applicable.

See illustrations for screw fastener pattern placement to stud framing.

Tabulated F1 loads are based on assembly tests with the load through the centerline of the stud. F1 loads require DSHS connector with (1) #10 screw to strut.

Allowable loads for self-drilling screws are based on installation in minimum 3/16"-thick structural steel with Fy = 36 ksi. Values listed above may be used where other thicknesses of steel are encountered provided that the fastener has equal or better tested values into thicker steel. It is the responsibility of the Designer to select the proper length fasteners based on the steel thickness installation.

For screw fastener installation into steel backed by concrete, predrilling of both the steel and the concrete is suggested. For predrilling, use a maximum 3/16"-
diameter drill bit. Screw to be installed through steel portion of channel strut (1.5 x screw diameter from punch-out) and centered vertically in web.

General Notes for Allowable Connector Load Tables

Allowable loads are based on cold-formed steel members with a minimum yield strength, Fy, of 33 ksi and tensile strength, Fu, of 45
ksi for 43 mil (18 ga.) and thinner, and a minimum yield strength of 50 ksi and tensile strength of 65 ksi for 54 mil (16 ga.) and thicker.

Allowable loads may not be increased for wind or seismic load.

Allowable loads for #12 self-drilling screws are based on a minimum nominal shear strength, Pss, of 2,520 lb. and nominal tension
strength, Pts, of 2,535 lb. and the allowable loads for #10 self-drilling screws are based on a minimum nominal shear strength, Pss,
of 1,620 lb. and nominal tension strength, Pts, of 2,460 lb.

It is the responsible of the Designer to select the proper length fasteners based on installation need. Screw length must ensure
fastener extends through the connection a minimum of three exposed threads unless noted otherwise.

Clips do not replace lateral or stability bracing. Design of bracing is the responsibility of the Designer.

It is the responsibility of the Designer to verify the adequacy of the stud. Allowable loads are based on clips installed an adequate
distance away from penetrations, notches, ends of studs and other conditions that may affect the clip performance.

It is the responsibility of the Designer to check the adequacy of the supporting structure for loads imposed by connectors.

Industry studies show that hardened fasteners can experience performance problems in wet or corrosive environments.
Accordingly, use these products in dry and non-corrosive environments only.